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The Positive Crankcase Ventilation (PCV) valve hose transfers excess gasses from the crankcase to the PCV valve. From there, it is added to the intake manifold and used by the engine. If the PCV valve hose breaks, the gas will not be transferred back into the engine, and your vehicle will be less efficient and have increased emissions. There are a few symptoms to watch out for when you have a bad or failing PCV valve hose.
1. Poor fuel economy
If the PCV valve hose is clogged or has a leak, it may cause poor fuel economy. This is because the vacuum on the intake side of the cylinder head will not be able to properly signal the correct amount of fuel that needs to be fed into the engine and can result in a lean or rich engine condition. If you suspect a PCV valve hose is the reason you have been getting poor fuel economy, contact the professionals at YourMechanic to have your PCV valve hose replaced.
2. Check Engine Light comes on
The Check Engine Light may come on for a variety of reasons, and one of them is a failing PCV valve hose. This is because the PCV valve hose works directly with your engine to ensure everything is working properly. The mechanics at YourMechanic can diagnose the exact reason the Check Engine Light is on, whether it is the PCV valve hose, the PCV valve, or a combination of parts.
3. Misfiring while idling
Another symptom of a bad or failing PCV valve hose is your vehicle will misfire while it is idling. This can be from a loss of vacuum due to the hose not working properly because of a leak, the hose being pinched, or becoming clogged from buildup over time. A misfire will sound like the engine has a vibration to it is a sign it is not running properly.
4. Noise from the engine
If you hear a hissing sound from the engine, it is time to get your vehicle looked at. The PCV valve hose may have a leak in it, which is causing the hissing sound. Leaving this for too long can cause misfires, rough running, vacuum leaks and you will have a more extensive repair on your hands.
YourMechanic makes getting repairs to your PCV valve hose easy by coming to your home or office to diagnose or fix issues. You can book a service online 24/7. YourMechanic’s qualifiedTechnicians are also available for any questions that may arise.
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CARS.COM -- The positive crankcase ventilation, or PCV, system was one of the earliest emission-control devices used in vehicles. The PCV system draws leftover combustion gases from the crankcase (the oil pan and bottom of the engine) and routes them back into the engine via the intake manifold, where they’re burned in the combustion chambers instead of escaping into the atmosphere via your exhaust system.
Related: More Service and Repair Tips
Most positive crankcase ventilation systems have a valve known as the PCV valve. When does the PCV valve need to be replaced? Let’s take a closer look.
PCV Valve Replacement
The PCV system is seldom listed as a maintenance item, but an old valve that is no longer functioning like it should can cause performance and emissions problems. A PCV valve that’s supposed to regulate the flow of these gases is the heart of most PCV systems (some newer vehicles don’t have a PCV valve). The PCV valve routes air and fuel from the crankcase back through the intake manifold to the cylinders rather than allowing them to escape into the atmosphere. If the valve doesn’t open and close on schedule, or if any part of the system clogs, the result can be a rough idle, sluggish acceleration or increased oil consumption. Rough idling is commonly caused by bad spark plugs, so problems with the PCV valve are often misdiagnosed. If you have a bad PCV valve, PCV valve replacement could eliminate the problems listed above.
Testing Your PCV Valve
The PCV valve is usually mounted in a grommet on a valve cover, at the end of a hose or tube. One way to check whether a PCV valve is functioning is to remove it from the hose or tube and shake it. If you can hear a metallic rattling noise, it’s likely in good working order. If you do not hear anything when you shake the valve, it is likely that it is no longer opening and closing like it should. You may be able to clean out the valve to get it functioning again, or you may need to replace it.
Whether an engine has a PCV valve or not, a hose or tube in the PCV system may become clogged from built-up sludge, or a vacuum hose may leak, so it pays to inspect the entire system, clean it if needed and test the valve for air flow. Hoses may also need to be replaced from time to time.
A clogged hose or PCV system or inoperative valve can increase oil consumption because pressure builds when the vapors in the crankcase aren’t allowed to flow into the combustion chambers. That additional pressure can force oil past seals and gaskets. If the valve is stuck in the open position, or there’s a leak in the system, that will allow too much air into the engine and throw off the air-fuel mixture, likely triggering the check engine light.
Though it’s not listed in the maintenance schedule in most vehicles, the PCV system should be inspected periodically to make sure it’s still in good condition, especially if engine performance has deteriorated. Fortunately, this valve is relatively easy to test and replace. Whether you opt to replace the valve yourself or you prefer to hire someone for professional valve replacement, installing a new valve could make your vehicle run much smoother.
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